Mortar mixer



FIG. 1 is a front, left perspective view of a mortar mixer showing the new design;

FIG. 2 is a left-side perspective view thereof;

FIG. 3 is a top perspective view thereof;

FIG. 4 is a front perspective view thereof;

FIG. 5 is a right-side perspective view thereof;

FIG. 6 is a rear perspective view thereof; and,

FIG. 7 is a bottom perspective view thereof.

The broken lines showing in FIGS. 1-7 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a mortar mixer, as shown and described. 